#include<stdio.h>
int main()
{
	int a,b,c,t=0;
	scanf("%d %d %d",&a,&b,&c);
	if(a>b)
	{
		t=a;
		a=b;
		b=t;
	}
	if(a>c)
	{
		t=a;
		a=c;
		c=t;
	}
	if(b>c)
	{
		t=b;
		b=c;
		c=t;
	}
	if(a+b<=c)
	{
		printf("Not triangle\n");
		return 0;
	}
	if(a*a+b*b==c*c)
	printf("Right triangle\n");
	else if(a*a+b*b>c*c)
	printf("Acute triangle\n");
	else if(a*a+b*b<c*c)
	printf("Obtuse triangle\n");
	if(a==b)
	printf("Isosceles triangle\n");
	if(a==b&&b==c)
	printf("Equilateral triangle\n");
    return 0;
}

